Tatteltale

You place one magical command on a creature that you can see asking it to refrain from an action such as traveling a certain distance, casting any spell, speaking a specific word or its synonyms, using a certain object, or making any attack (other actions up to DM discretion).  The creature can must succeed on a Wisdom saving throw. On a failed wisdom save if they perform the forbidden command a mental alarm is set off in your head. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you can designate an additional person to receive this mental alarm if the action is performed.